JPH0590877U - Lightning arrester with built-in disconnection mechanism - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a lightning protection insulator with a built-in disconnection mechanism having an operation display structure of a novel separation mechanism in which the airtightness of the grounding side opening provided with the separation mechanism is maintained. [Structure] A conductive plastic body 171 and a pair of upper and lower gap metal fittings 172, 172 fixed to both ends of the conductive plastic body 171 and having a discharge gap G formed therebetween.
In a lightning arrester with a built-in disconnection mechanism, in which a disconnection mechanism 17 including the above is housed in series in the lightning protection element 2 in the insulator tube 1 between the lightning protection element 2 and the ground-side terminal fitting 22, While the magnet 25 is provided on the outer surface of the gap metal fitting 172,
An iron piece 21 is provided on the ground-side terminal fitting 22 and a sealed case 31 having a transparent portion at the lower portion is provided on the outer surface of the ground-side terminal fitting 22, and the lower end gap fitting 1 is provided in the sealed case 31.
A disk-shaped magnet 29, whose magnetic pole on the surface facing the magnet 25 provided on the outer surface of 72 has the same pole, is housed so that it can be moved up and down or inverted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lightning protection insulator with a built-in disconnection mechanism.

[0002]

[Prior Art]

 The present applicant has previously considered and applied for a lightning arrester with a built-in disconnection mechanism as shown in FIGS. 4 and 5 (see Japanese Utility Model Laid-Open No. 4-20204). The outline is explained below based on the figure.

Based on a cylindrical thermoplastic polymer (for example, polyethylene) in which openings 1a and 1b are provided at both ends and a pressure release port 20 is bored with a phase difference of 180 degrees in the circumferential direction. The insulator body (insulator tube) 1 made has a non-linear resistance characteristic mainly composed of zinc oxide, which has low resistance to surge voltage and high resistance to normal ground voltage of power transmission and distribution lines. A plurality of excellent current limiting elements (hereinafter referred to as lightning protection elements) 2 are housed in a laminated form, and a fastener 4 for electrically connecting to the line side electric wire 3 is provided in the line side opening 1a, and another A support fitting 5 is provided in the ground-side opening 1b so as to hermetically seal the openings 1a and 1b.

Then, an electrode terminal 7 electrically connected to the fastener 4 via a coil spring (not shown) is inserted into the opening 1 a, and an electrical connection is made between the uppermost lightning arrester element 2. Have been introduced to. On the other hand, in the opening 1b covered with the support fitting 5, a separating mechanism 17 to be described later is provided between the lowest lightning arrester element 2 and the supporting fitting 5, and a display rod 19 for displaying the operation of the separating mechanism 17 is provided. The support body 10 having a through hole 10a through which the hole is inserted is provided so as to seal the support body 10.

Screw rods 12 and 12 are screwed onto the upper part of the fastener 4, and a tightening plate 13 is provided on the screw rods 12 and 12, and a wire on the line side is provided between the tightening plate 13 and the upper part of the fastener 4. It is configured to hold 3.

Reference numeral 15 is a fixed board disposed at the lowermost end of the lightning protection element 2, and a packing 16 is fitted on the outer circumference of the lightning protection element 2 so as to seal between the inner circumference of the insulator body 1. ing.

The separation mechanism 17 is fixed to both ends of the conductive plastic 171 and conductive plastic 171 whose conductivity is selected so as to melt and function as a heating resistor when the temperature rises to a predetermined value. Gap fittings 172 and 172 having a discharge gap formed therein and a tension spring 18 between the lower end gap fitting 172 and the support fitting 5 are attached to the fixed board 15 while the upper end gap fitting 172 is attached to the fixed plate 15. When the conductive plastic 171 is melted and cut by the tension spring 18, the tension spring 18 pulls downward and separates.

The display bar 19 is a display member that indicates whether or not the separating mechanism 17 has operated, and is fixed to the lower end of the conductive plastic 171 of the separating mechanism 17, and the itself is the support member 10. The inside of the through hole 10a is separated to move up and down in accordance with the operation of the mechanism 17, and as shown in FIG. 5, when the conductive plastic 171 is melted, the tip is projected from the support body 10 Has been done.

In the above-described lightning protection insulator with a built-in disconnection mechanism, when the lightning protection element 2 is aged or damaged, when the surge voltage flows to the lightning protection element 2, the lightning protection element 2 heats up, and accordingly, the lightning protection element 2 of the disconnection mechanism 17 is damaged. The conductive plastic 171 melts and separates, and at the same time, the pulling spring 18 acts to lower the lower part of the conductive plastic 171 to cut off the ground circuit. At the same time, when the conductive plastic 171 descends, the tip of the indicator bar 19 attached to it protrudes from the support body 10, so the disconnection mechanism 17 has operated, and as a result, the lightning protection element 2 has deteriorated over time and has been damaged. It will be visible from the outside.

[0010]

[Problems to be solved by the device]

 By the way, the lightning protection insulator with built-in disconnection mechanism can be easily checked from the outside whether or not the disconnection mechanism 17 has been operated, so repair or replacement at the time of failure such as deterioration or damage of the lightning protection element 2 is timely. In addition to being able to do it, it has the advantage that the work is unnecessary compared to connecting the lightning arrester and the disconnection mechanism separately, and the overall size is compact, but the opening 1b with the disconnection mechanism 17 and the outside Means that the indicator rod 19 is inserted and communicates with the through hole 10a of the support body 10, and the opening 1b provided with the separating mechanism 17 and the portion provided with the lightning protection element 2 are fixed. Since it is only sealed by the packing 16 fitted on the board 15, it may sometimes lack airtightness, causing problems such as accelerated deterioration of the lightning protection element 2.

The present invention has been made in order to solve the above problems, and an object thereof is to display an operation of a novel separating mechanism in which the airtightness of a grounding side opening provided with the separating mechanism is maintained. (EN) Provided is a lightning protection insulator having a structure and a built-in disconnection mechanism.

[0012]

[Means for Solving the Problems]

 One of the lightning protection insulators with a built-in disconnection mechanism according to the present invention developed by the above-mentioned circumstances is a conductive plastic body whose conductivity is selected so as to melt and function as a heating resistor when the temperature rises to a predetermined value. A disconnection mechanism, which is fixed to both ends of this conductive plastic body and includes a pair of upper and lower gap fittings with a discharge gap formed between them, is provided in the insulator tube between the lightning protection element and the ground side terminal fitting. In a lightning arrester with a built-in disconnection mechanism that is housed in series with the element, a magnet is provided on the outer surface of the gap metal fitting at the lower end, while a magnetic material is provided on the ground side terminal metal fitting and a lower part is provided on the outer surface of the ground terminal metal fitting. An airtight case with a transparent part is provided, and a magnet for display having a magnetic pole on the surface facing the magnet provided on the outer surface of the gap metal fitting at the lower end has the same pole in this airtight case. Those formed by descending enable or reversible accommodated.

Further, one is a conductive plastic body whose conductivity is selected so as to melt and function as a heating resistor when the temperature rises to a predetermined value, and fixed to both ends of this conductive plastic body and between them. A lightning protection device with a built-in disconnection mechanism, in which a disconnection mechanism that includes a pair of upper and lower gap fittings with a discharge gap is housed in series with the lightning protection element in the insulator tube between the lightning protection element and the ground-side terminal fitting. In the insulator, a thin portion is formed on the wall of the insulator tube containing the detaching mechanism, a miniature ball is provided on this thin portion, and the miniature ball is connected to the battery provided in the insulator tube incorporating the detaching mechanism. The switch turns on when the disconnection mechanism operates.

[0014]

[Action]

 According to the lightning protection insulator with a built-in disconnection mechanism of the present invention, the former shows that the display when the disconnection mechanism is operated is based on the repulsive force and / or the attraction force of the magnets provided inside and outside the grounding side terminal fitting. Since the magnet display provided outside the metal fittings is operated to display, the grounding side opening that accommodates the disconnection mechanism is completely sealed inside and outside by the grounding side terminal metal fittings provided at the lower end of the insulator tube. Sexuality improves. This also prevents deterioration of the lightning protection element due to poor airtightness.

Further, in the latter, since the display mechanism by the miniature ball and the battery is installed in the porcelain tube together with the disconnecting mechanism section, the grounding side opening is completely inside and outside by the grounding side terminal fitting provided at the lower end of the porcelain tube like the former. The airtightness is improved by shutting off. Further, this can prevent deterioration of the lightning protection element due to poor airtightness.

The material of the porcelain insulator is not particularly limited, but thermoplastic polymers, porcelain and the like can be used.

[0017]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. In the present invention, the structure on the ground side is improved, and the line side is the same as the structure of the conventional lightning arrester with a built-in disconnection mechanism. Further, the articles having the same names as those of the conventional lightning protection insulator with a built-in disconnection mechanism will be described with the same reference numerals.

(Embodiment 1) FIG. 1 is a cross-sectional explanatory view of a main part of a lightning arrester with a detachment mechanism according to the present invention. In the figure, reference numeral 1 denotes an insulator main body, and a line-side opening 1a thereof is covered with a fastener 4 that is electrically connected to the line-side electric wire 3 so as to hermetically seal. In addition, a plurality of lightning protection elements 2 are housed in the inside thereof in a laminated form.

On the other hand, the ground-side opening 1b of the insulator body 1 is provided with a ground-side terminal metal fitting 22 to which an iron piece 21 is bonded and fixed inside so as to be hermetically sealed by caulking through a packing 23. ing. A disconnecting mechanism 17 to be described later is provided between the lowest lightning arrester element 2 and the grounding side terminal fitting 22, while an indicator 24 for displaying the operation of the disconnecting mechanism 17 is provided on the outer surface of the grounding side terminal fitting 22. Is provided.

The separating mechanism 17 is fixed to both ends of the conductive plastic 171 and conductive plastic 171 whose conductivity is selected so as to melt and function as a heating resistor when the temperature rises to a predetermined value. The hat-shaped gap metal fittings 172, 172 having the discharge gap G formed therein, the tension spring 18 between the lower end gap metal fitting 172 and the ground side terminal metal fitting 22, and the S pole on the lower surface of the lower end gap metal fitting 172. With the magnet 25 installed below, the upper end gap metal fitting 172 is pressed against the lower end of the lightning protection element 2 by the insulating pipe 27 provided between the metal fitting 26 fixed there and the ground side terminal metal fitting 22. Mounting, so that when the conductive plastic 171 is melted by the tension spring 18, the gap metal fitting 172 at the lower end is pulled downward and separated.Reference numeral 28 is a lead wire provided between the gap metal fitting 172 at the lower end and the ground side terminal metal fitting 22.

The display unit 24 is attached to the outer surface of the ground-side terminal fitting 22 with the S pole facing upward and attracted to the inner iron piece 21, and the outer surface has a disk-shaped magnet 29 of a predetermined thickness having a display color. The outer surface of the ground-side terminal metal fitting 22 that covers the disk-shaped magnet 29 and the lower part of the outer surface is transparent so that the display color can be visually recognized from the transparent part 30 when the disk-shaped magnet 29 falls. And a closed case 31 attached to the.

The lightning arrester with a built-in disconnection mechanism according to the present invention has the above-described structure. Therefore, when the lightning protection element 2 deteriorates and the conductive plastic 171 melts and the disconnection mechanism 17 operates, The gap metal fitting 172 is pulled down to the vicinity of the inner surface of the grounding side terminal metal fitting 22 by the tension spring 18, so that the S pole of the magnet 25 inside the grounding side terminal metal fitting 22 and the S pole of the outer disk magnet 29 repel each other. Then, as shown in FIG. 2, the disk-shaped magnet 29 descends in the closed case 31 so that the display color can be visually recognized from the transparent portion, which makes it easy to confirm that the separating mechanism 17 has operated. Further, the grounding side opening 1b of the insulator body 1 is covered with the grounding side terminal metal fitting 22 to which the iron piece 21 is bonded and fixed on the inside through the packing 23 and is caulked to be hermetically sealed. Since the lightning protection element 2 has good properties, deterioration due to poor airtightness of the lightning protection element 2 can be prevented.

In the first embodiment, the diameter difference between the inner diameter of the sealed case 31 and the outer diameter of the disk magnet 29 is reduced so that the disk magnet 29 descends in the sealed case 31. The disc magnet 29 may be configured to be reversible in the sealed case 31 while increasing the diameter difference, and the disc type magnet 29 may be provided with a display color on the S pole surface side and the sealed case 31 may be formed of a transparent body. In this configuration, when the lightning arrester element 2 is deteriorated and the conductive plastic 171 is melted and the gap metal fitting 172 at the lower end is pulled down to the vicinity of the inner surface of the ground side terminal metal fitting 22 by the tension spring 18, the inside of the ground side terminal metal fitting 22 is closed. The S pole of the magnet 25 and the S pole of the outer disk magnet 29 repel each other, which causes them to be reversed and attracted to the N pole of the disk magnet 29. Through this, it is possible to easily confirm that the separating mechanism 17 has operated as in the first embodiment.

(Embodiment 2) FIG. 3 is a cross-sectional view of a main portion of another lightning protection insulator with a built-in disconnection mechanism according to the present invention, in which the iron piece 21, the display portion 24 and the magnet 25 described in Embodiment 1 are replaced. Instead of the display mechanism provided, as shown in FIG. 3, a thin wall portion 34 having an inner side formed in a groove 33 is formed in a wall portion 32 on the lower end side of the insulator body 1, and a bean ball 35 is formed in the groove 33. While the battery 36 is provided, the switch 37 is provided on the inner surface of the grounding side terminal fitting 22, and the miniature ball 35, the battery 36, and the switch 37 are configured by the wiring 38. Same configuration.

In the above structure, when the lightning protection element 2 deteriorates and the conductive plastic 171 melts and separates, the gap mechanism 172 at the lower end moves to the vicinity of the inner surface of the ground-side terminal fitting 22 by the tension spring 18. The gap metal fitting 172 at the lower end that has been pulled down operates the switch 37 provided on the inner surface of the grounding side terminal metal fitting 22, and the miniature ball 35 is illuminated by this, so the miniature ball 35 is illuminated through the thin portion 34. It was confirmed that the cutting mechanism 17 was operated, as in the first embodiment. Further, the grounding-side opening 1b of the insulator body 1 is covered with the grounding-side terminal metal fitting 22 through the packing 23 and is caulked so as to hermetically seal, so that the lightning-tightness of the lightning arrester element 2 is good. Deterioration due to defects can be prevented.

[0026]

[Effect of the device]

 As described above, according to the lightning protection insulator with built-in disconnection mechanism according to the present invention, it is possible to easily confirm from the outside of the ceramic insulator that the disconnection mechanism has been operated by the display mechanism, and this display mechanism is provided at the grounding side opening of the ceramic insulator. Since the display operation can be performed even if the grounding side terminal fitting is covered with a packing and is caulked and hermetically sealed, deterioration of the lightning arrester due to poor airtightness can be prevented without impairing the airtightness of the insulator. ..

[Brief description of drawings]

FIG. 1 is an explanatory cross-sectional view of a main part of a lightning arrester with a detachment mechanism according to the present invention.

FIG. 2 is an enlarged sectional view of an essential part showing a state in which the lightning protection insulator with a built-in disconnection mechanism shown in FIG. 1 is operated.

FIG. 3 is a cross-sectional explanatory view of a main part of another lightning protection insulator with a built-in disconnection mechanism according to the present invention.

FIG. 4 is a half longitudinal sectional view of a conventional lightning protection insulator with a built-in disconnection mechanism.

5 is an enlarged cross-sectional view of essential parts showing a state in which the lightning protection insulator with a built-in disconnection mechanism shown in FIG. 4 is operated.

[Explanation of symbols]

1: Insulator body 1a: Track side opening 1
b: grounding side opening 2: lightning protection element 3: line side wire
4: Fastener 17: Separation mechanism 171: Conductive plastic
172: Gap fitting 18: Tension spring 21: Iron piece 2
2: Ground side terminal fitting 23: Packing 24: Display section 2
5: Magnet 26: Metal fitting 27: Insulation pipe 2
8: Lead wire 29: Disc magnet 30: Transparent part 3
1: Sealed case 32: Wall 33: Groove 3
4: Thin part 35: Bean ball 36: Battery 3
7: Switch 38: Wiring G: Discharge gap

Claims (3)

[Scope of utility model registration request] 1. A conductive plastic body whose conductivity is selected so as to melt and function as a heating resistor when the temperature rises to a predetermined value, and a discharge gap fixed between both ends of the conductive plastic body and having a discharge gap therebetween. A disconnecting mechanism including a pair of upper and lower gap fittings formed,
In a lightning arrester with a built-in disconnection mechanism, which is housed in series with the lightning protection element in the insulator tube between the lightning protection element and the grounding side terminal fitting, a magnet is provided on the outer surface of the gap fitting at the lower end while the grounding side terminal fitting is provided. A magnetic body is provided, and a sealed case having a transparent portion at the bottom is provided on the outer surface of the ground-side terminal fitting, and the magnetic pole on the surface facing the magnet provided on the outer surface of the gap fitting at the lower end has the same pole. A lightning protection insulator with a built-in disconnection mechanism, characterized in that a display magnet is housed in a vertically movable or reversible manner. 2. The lightning protection insulator with a built-in disconnection mechanism according to claim 1, wherein the display magnet comprises a display body in which the magnet is embedded. 3. A conductive plastic body, the conductivity of which is selected so as to melt and function as a heating resistor when the temperature rises to a predetermined value, and a discharge gap fixed between both ends of the conductive plastic body. A disconnecting mechanism including a pair of upper and lower gap fittings formed,
In a lightning arrester with a built-in disconnection mechanism, which is housed in series with the lightning protection element in the insulation tube between the lightning protection element and the ground-side terminal metal fitting, a thin wall portion is formed on the wall of the ceramic insulation tube containing the disconnection mechanism. A lightning protection insulator with a built-in disconnection mechanism, characterized in that a miniature ball is provided and the bean ball is connected to a battery provided in an insulator tube having a built-in disconnection mechanism, and a switch is turned on when the disconnection mechanism operates. ..